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High-strength high-tenacity rare earth-containing steel material for Z-type steels

A high-toughness, high-strength technology, applied in the field of metal materials produced in the metallurgical industry, can solve problems such as inability to perform heat treatment, hidden dangers in the use of carriages, and decreased toughness, and achieve the effects of improving labor productivity, reducing the weight of the car body, and increasing strength

Inactive Publication Date: 2012-03-28
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 310 B-beam welded by the railway vehicle factory uses a 450MPa grade steel plate, but due to the obvious deterioration of the performance after welding and the inability to perform heat treatment, the strength and toughness are reduced, which brings hidden dangers to the use of the carriage

Method used

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  • High-strength high-tenacity rare earth-containing steel material for Z-type steels
  • High-strength high-tenacity rare earth-containing steel material for Z-type steels
  • High-strength high-tenacity rare earth-containing steel material for Z-type steels

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Experimental program
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Effect test

Embodiment Construction

[0009] After special research by scientific and technical personnel and tests in a 25kg vacuum induction furnace, the composition range of molten steel was designed as shown in Table 1, and the name of the steel grade was YQ450NbRE.

[0010] Table 1 Composition requirements of YQ450NbRE special steel for B-shaped steel, w%

[0011]

[0012]

[0013] The technological process is: 100t converter smelting→100t L F furnace refining→continuous casting (the billet specification is 319mm×410mm).

[0014] Two heats of steel were produced in industrial trial production, and the specific process parameters were controlled as follows:

[0015] 1) Converter production

[0016] The carbon content, phosphorus content and tapping temperature of the molten steel at the end of the converter are shown in Table 2.

[0017] Table 2 Composition and temperature of YQ450NbRE furnace-tapped steel for B-shaped steel

[0018] Test No.

Tapping temperature, ℃

Tapping carbon cont...

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Abstract

The invention relates to a high-strength high-tenacity rare earth-containing steel material for Z-type steels, which is characterized by comprising the following components in percentage by weight: 0.06-0.12% of carbon, 0.20-048% of silicon, 1.20-1.65% of manganese, 0.2-0.4% of copper, 0.2-0.4% of nickel, 0.2-1.0% of chromium, 0.03-0.14% of vanadium, 0.020-0.055% of niobium, 0.02-0.04% of rare earth, less than or equal to 0.025% of phosphorus, less than or equal to o.o15% of sulfur and the rest of iron and unavoidable impurities. The high-strength high-tenacity rare earth-containing steel material for Z-type steels has the advantages of being reasonable in composition proportion, integrating a plurality of excellent properties such as high strength, atmospheric corrosion resistance, favorable low-temperature impact tenacity, favorable welding property and the like and according with the mechanical property requirements of Z-type steels.

Description

technical field [0001] The invention relates to a special high-strength and high-toughness rare earth-containing B-shaped steel, which belongs to the field of metal materials produced in the metallurgical industry. Background technique [0002] 310 B-shaped steel is a special special-shaped steel for making the middle beam of train carriages. It is an important guarantee for high-speed and heavy-duty trains. It is required to have high strength and good low-temperature impact toughness. The 310 B-beam welded by the railway vehicle factory uses a 450MPa grade steel plate, but due to the obvious deterioration of the performance after welding and the inability to perform heat treatment, the strength and toughness are reduced, which brings hidden dangers to the use of the carriage. Therefore, it is urgent to develop and produce high-strength and weather-resistant 310 B-shaped steel special steel as soon as possible. Contents of the invention [0003] The object of the present...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/48
Inventor 李春龙姜德刚张晓光刘建国刘承军何建中李凯曹晖韩凤英刘平涛雅
Owner INNER MONGOLIA BAOTOU STEEL UNION
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